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  1. Patel JH, Amaral AFS, Minelli C, Elfadaly FG, Mortimer K, El Sony A, et al.
    Thorax, 2023 Sep;78(9):942-945.
    PMID: 37423762 DOI: 10.1136/thorax-2022-218668
    Poverty is strongly associated with all-cause and chronic obstructive pulmonary disease (COPD) mortality. Less is known about the contribution of poverty to spirometrically defined chronic airflow obstruction (CAO)-a key characteristic of COPD. Using cross-sectional data from an asset-based questionnaire to define poverty in 21 sites of the Burden of Obstructive Lung Disease study, we estimated the risk of CAO attributable to poverty. Up to 6% of the population over 40 years had CAO attributable to poverty. Understanding the relationship between poverty and CAO might suggest ways to improve lung health, especially in low-income and middle-income countries.
  2. Müller A, Wouters EF, Koul P, Welte T, Harrabi I, Rashid A, et al.
    Pulmonology, 2024 Apr 13.
    PMID: 38614859 DOI: 10.1016/j.pulmoe.2024.03.005
    BACKGROUND: Dyspnoea is a common symptom of respiratory disease. However, data on its prevalence in general populations and its association with lung function are limited and are mainly from high-income countries. The aims of this study were to estimate the prevalence of dyspnoea across several world regions, and to investigate the association of dyspnoea with lung function.

    METHODS: Dyspnoea was assessed, and lung function measured in 25,806 adult participants of the multinational Burden of Obstructive Lung Disease study. Dyspnoea was defined as ≥2 on the modified Medical Research Council (mMRC) dyspnoea scale. The prevalence of dyspnoea was estimated for each of the study sites and compared across countries and world regions. Multivariable logistic regression was used to assess the association of dyspnoea with lung function in each site. Results were then pooled using random-effects meta-analysis.

    RESULTS: The prevalence of dyspnoea varied widely across sites without a clear geographical pattern. The mean prevalence of dyspnoea was 13.7 % (SD=8.2 %), ranging from 0 % in Mysore (India) to 28.8 % in Nampicuan-Talugtug (Philippines). Dyspnoea was strongly associated with both spirometry restriction (FVC

  3. Amaral AFS, Potts J, Knox-Brown B, Bagkeris E, Harrabi I, Cherkaski HH, et al.
    Int J Epidemiol, 2023 Dec 25;52(6):e364-e373.
    PMID: 37862437 DOI: 10.1093/ije/dyad146
  4. Amaral AFS, Burney PGJ, Patel J, Minelli C, Mejza F, Mannino DM, et al.
    Thorax, 2021 12;76(12):1236-1241.
    PMID: 33975927 DOI: 10.1136/thoraxjnl-2020-216223
    Smoking is the most well-established cause of chronic airflow obstruction (CAO) but particulate air pollution and poverty have also been implicated. We regressed sex-specific prevalence of CAO from 41 Burden of Obstructive Lung Disease study sites against smoking prevalence from the same study, the gross national income per capita and the local annual mean level of ambient particulate matter (PM2.5) using negative binomial regression. The prevalence of CAO was not independently associated with PM2.5 but was strongly associated with smoking and was also associated with poverty. Strengthening tobacco control and improved understanding of the link between CAO and poverty should be prioritised.
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